<template>
  <div>
    这个是sync --- 父组件 --- {{ num }} --- {{ num2 }}
    <hr>
    <Son
      :aa="num"
      :bb="num2"
      @update:aa="val => num=val"
      @update:bb="val => num2=val"
    />
    <hr>
    <Son
      :aa.sync="num"
      :bb.sync="num2"
    />
  </div>
</template>

<script>
import Son from './Son.vue'
export default ({
  components: {
    Son
  },
  data() {
    return {
      num: 100
    }
  }
})
</script>
